[SciPy-Dev] Github code for Differential Evolution reevaluations

[James Phillips]

I have just reviewed the Differential Evolution code in github.  It is is
particularly well coded and most algorithmically thorough, my professional
compliments.

I noticed in the older DE code I use there is a possible performance
improvement, and this seems to be the case in the github code as well.  Not
every population vector changes within a generation, yet my older code
reevaluates the unchanged vectors.  Of course this does not change the
final results, but is a point of potential savings in total computation
time.

Respectfully,

James Phillips
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